Chen Haiming, Koh J Justin, Liu Mengmeng, Li Pengju, Fan Xiaotong, Liu Siqi, Yeo Jayven C C, Tan Yujun, Tee Benjamin C K, He Chaobin
Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore.
Agency for Science, Technology and Research (A*STAR), Singapore Institute of Manufacturing Technology, 73 Nanyang Drive, Singapore 637662, Singapore.
ACS Appl Mater Interfaces. 2020 Jul 15;12(28):31975-31983. doi: 10.1021/acsami.0c08213. Epub 2020 Jun 29.
Poly(dimethylsiloxane) (PDMS) as one of the electron-drawing materials has been widely used in triboelectric nanogenerators (TENG), which is expected to generate electron through friction and required to endure dynamic loads. However, the nature of the siloxane bond and the low interchain interaction between the methyl side groups result in low fracture energy in PDMS elastomers. Here, a strategy that combined the advantages of the dynamic of hierarchical hydrogen bonding and phase-separation-like structure was adopted to improve the toughness of PDMS elastomers. By varying both stronger and weaker hydrogen bonding within the PDMS network, a series of super tough (up to 24,000 J/m), notch-insensitive, transparent, and autonomous self-healable elastomers were achieved. In addition, a hydrophilic polymeric material (PDMAS-U10) was synthesized as the conductive layer. A transparent TENG was fabricated by sandwiching the PDMAS-U10 between two pieces of the PDMS elastomer. Despite its hydrophilic nature, PDMAS-U10 exhibit strong adhesion interaction with hydrophobic PDMS elastomers. As such, a tough (16,500 J/m), self-healable (efficiency ∼97%), and transparent triboelectric nanogenerator was constructed. A self-powered system employing the TENG is also demonstrated in this work.
聚二甲基硅氧烷（PDMS）作为一种吸电子材料，已广泛应用于摩擦纳米发电机（TENG）中，该发电机有望通过摩擦产生电子，并需要承受动态载荷。然而，硅氧烷键的性质以及甲基侧基之间的链间相互作用较弱，导致PDMS弹性体的断裂能较低。在此，采用了一种结合分层氢键动力学和类相分离结构优点的策略来提高PDMS弹性体的韧性。通过改变PDMS网络中较强和较弱的氢键，制备出了一系列超韧性（高达24000 J/m）、抗缺口、透明且能自主自愈的弹性体。此外，合成了一种亲水性聚合物材料（PDMAS-U10）作为导电层。通过将PDMAS-U10夹在两片PDMS弹性体之间制备了一种透明的TENG。尽管PDMAS-U10具有亲水性，但它与疏水性PDMS弹性体表现出很强的粘附相互作用。因此，构建了一种坚韧（16500 J/m）、可自愈（效率约97%）且透明的摩擦纳米发电机。在这项工作中还展示了一个采用该TENG的自供电系统。
